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that lies beneath the entire state of california. this is all the more surprising because before its settlement, low rainfall made most of this region a virtual desert. the coastal plain of southern california, of which orange county is a part, is particularly well suited for, uh, groundwater storage. it has several things going for it. a--it's very deep, some 4,000 feet deep, uh, to, uh... all containing fresh water, of which we only use about the upper 1,500 feet. it has a, uh... surface water supply. it's the only perennial stream in southern california. the--this stream is fed by-- by snow melt in a very large mountain range behind us. again, in a desert area, we have snow that feeds a perennial river system which provides continuous water supply. another factor that helps out a great deal in maintaining the flow of the water down this river is the fact that we have considerable residential and commercial development upstream of us, which, uh, provides us waters of waste-water origin. that means the water has gone through a treatment plant once upstream and has gone through a ser
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